Frank
8212d4451a
Mechanical identity rename across the knowledge base, AGENTS.md, README, the
hermes config example, and homepage services.json. No behavior change; served
aliases on the LLM endpoints change with the deploy of commit 69f87c8.
118 lines
5.2 KiB
Markdown
118 lines
5.2 KiB
Markdown
---
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type: reference
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title: qBittorrent
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description: qBittorrent download client for the *arr stack — pinned 4.6.7 on FrankBook-Pro, shares the Gluetun WireGuard netns, PBKDF2 WebUI credential recipe.
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tags: [qbittorrent, arr-stack, frankbook-pro, gluetun]
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timestamp: 2026-09-03T00:00:00Z
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---
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# qBittorrent
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qBittorrent is the torrent download client for the *arr stack. The stack runs on
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**FrankBook-Pro** (the Mac mini) as quadlet units inside its podman machine —
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not on Dankserver. It receives download requests from Sonarr, Radarr, Lidarr,
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and Readarr via category tagging.
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**Host:** FrankBook-Pro (podman machine) — **Access:** WebUI on port `8080`,
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published by the [[Gluetun]] unit because qBittorrent shares that container's
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network namespace (a netns-sharer publishes no ports of its own).
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## Facts
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| Item | Value |
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|------|-------|
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| Image | `lscr.io/linuxserver/qbittorrent:4.6.7` — **pinned**, see the pin rationale below |
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| Network | `Network=gluetun.container` (torrent egress exits via the WireGuard/ProtonVPN tunnel) |
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| Ports | 8080 (WebUI) and 6881 TCP+UDP published on the gluetun unit |
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| Env | `PUID=0`, `PGID=0`, `TZ=America/Los_Angeles`, `UMASK_SET=022` |
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| Volumes | `/Volumes/COMPLETE/qbittorrent-data:/config`, plus `/Volumes/COMPLETE` and `/Volumes/INCOMPLETE` mounted at identical paths |
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| Auth | Web UI username/password (`admin` + generated password); LAN bypass not used |
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## Why the 4.6.7 pin exists (2026-09-01)
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Readarr's abandoned qBittorrent client rejects qB ≥ 5's **204 empty-body login
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success** as `Authentication failure` — a runtime break, not just an API-create
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issue. The fleet pins `lscr.io/linuxserver/qbittorrent:4.6.7` while Readarr is
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in the stack. **Never unpin to `latest` while Readarr is in the fleet.**
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Second trap on any version flip: qB 5.x's shutdown conf rewrite leaves a
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`WebUI\Password_PBKDF2=@ByteArray(...)` line that 4.6.7 rejects — every login
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then returns "invalid credentials" (the arrs included). Fix = rewrite the same
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conf line with the same password while qB is stopped.
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## Persistent WebUI credentials (verified 2026-08-30)
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qBittorrent 5 mints a **new temporary password at every start** unless a
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password is stored in `qBittorrent.conf`. That rotation silently breaks every
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arr download client after each reboot. The Web-API has no password endpoint
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any more (`/api/v2/app/setPassword` was removed), and the linuxserver image
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has no `WEBUI_AUTH` handling — so persistence must be written to the conf
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directly, in qb's own `salt:hash` format (`src/base/utils/password.cpp`:
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PBKDF2-HMAC-SHA512, 100 000 iterations, 16-byte salt = 4×uint32, then
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`base64(salt) + ":" + base64(hash)` as the raw value):
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```python
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import base64, hashlib, os
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salt = os.urandom(16)
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h = hashlib.pbkdf2_hmac("sha512", password.encode(), salt, 100000, 64)
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val = (base64.b64encode(salt) + b":" + base64.b64encode(h)).decode()
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# with the container STOPPED, in [Preferences]:
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# WebUI\Username=admin
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# WebUI\Password_PBKDF2=<val>
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```
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Then `podman start qbittorrent` and confirm login survives a
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`podman restart` — the temp-password rotation stops the moment stored
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credentials verify. The chosen value lives host-local in `/home/dank/.qbpass`
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(mode 600, owner `dank`) — never in git; every arr download client and
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[[Prowlarr]] reference it. (The classic `@ByteArray(salt+hash)` form is WRONG
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for qb5: login 401s on it; verify() base64-decodes the two halves separately.)
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## Deployment (current)
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Quadlet unit `qbittorrent.container` from this repo
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(`frankbook-pro/qbittorrent/quadlet/`), installed inside the podman machine at
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`/home/core/.config/containers/systemd/qbittorrent.service` by the
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frankbook-pro handler in `scripts/deploy-remote.sh`:
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```ini
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[Container]
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ContainerName=qbittorrent
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Image=lscr.io/linuxserver/qbittorrent:4.6.7
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Network=gluetun.container
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Environment=PUID=0
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Environment=PGID=0
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Environment=TZ=America/Los_Angeles
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Environment=UMASK_SET=022
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Volume=/Volumes/COMPLETE/qbittorrent-data:/config
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Volume=/Volumes/COMPLETE:/Volumes/COMPLETE
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Volume=/Volumes/INCOMPLETE:/Volumes/INCOMPLETE
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[Service]
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TimeoutStartSec=900
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Restart=always
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```
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## Gotchas (verified live)
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- Temporary-password rotation on every boot is the default state of an
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untouched qb5 — see the persistence recipe above; without it, all arr
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download clients silently fail queue adds ("Couldn't add release … to
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download queue" in the arr logs) after any restart.
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- API login from `curl` needs a `Referer: http://<host>:<port>/` header
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(CSRF protection) or POSTs get rejected even with a valid SID.
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- Cookie-name quirk by version: qB 5.x names its WebUI session cookie
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`QBT_SID_<port>`; 4.6.7 uses plain `SID`. Any automation must parse the
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cookie generically (e.g. `grep -oE '[A-Za-z_]*SID[A-Za-z0-9_]*=[^;[:space:]]*'`)
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instead of hard-coding a port-suffixed name, or it fails with 403 cascades
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that never reach qB as failed logins.
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- Egress verification for this stack must run **inside the gluetun container**
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(`podman exec gluetun wget -qO- https://ipinfo.io/json`); running the same
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probe one ssh-context out returns the residential IP — a false leak alarm.
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- Ensure umask is set to `022` so downloaded files are readable by arr apps.
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## See Also
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- [[ARR-Stack]] — full *arr stack documentation
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- [[Gluetun]] — the WireGuard tunnel this container shares
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